"Then, at the back," said Wemmick, "out of sight, so as not to impede the idea of fortifications,—for it’s a principle with me, if you have an idea, carry it out and keep it up,—I don’t know whether that’s your opinion—"

There are no more uses of "impede" in the book.

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She is impeding the progress of our project

But the hill was treacherously steep; he was impeded by the snow and his own lack of strength.